VEERED OFF SIDE OF HIGHWAY, STRUCK SOMETHING HEAD-ON AND WAS RENDERED UNCONSCIOUS AS HEAD HIT STEERING WHEEL. I WAS TRANSPORTED UNCONSCIOUS IN AMBULANCE FROM CRASH SCENE TO LOCAL HOSPITAL, WHERE I WAS AN INPATIENT FOR TWO DAYS. EXTENSIVE DAMAGE TO FRONT OF VEHICLE INDICATED THE SEVERITY OF IMPACT... YET AIR BAGS DID NOT DEPLOY. I BELIEVE AIR BAGS SHOULD HAVE DEPLOYED ON IMPACT AND I WOULD NOT HAVE BEEN RENDERED UNCONSCIOUS, AND COULD HAVE CONTROLLED VEHICLE TO AVOID STRIKING TREE, BRUSH, ETC. I CONTACTED GMC CORPORATE.. TO ADVISE MY CONCERNS FOR SAFETY... RECEIVED A FOLLOW UP TELEPHONE CALL FROM GMC REPRESENTATIVE... (HE) EXPRESSED NO INTEREST IN MY COMPLAINT... REFUSED TO COMMENT ON MY STATEMENT THAT AIR BAG FAILED TO DEPLOY RESULTING IN EXTENSIVE DAMAGE TO FRONT OF VEHICLE AND SUSTAINING A HEAD INJURY AS NO BAG DEPLOYED. NO MATTER THAT I AM LEASING THE VEHICLE AND FEAR FOR MY SAFETY... I WAS ADVISED THAT GMC HAD NO FURTHER INTEREST IN THIS MATTER AND WOULD NOT EVALUATE MY SAFETY CONCERNS. *TR